Fair Value of Financial Instruments - Summary of Changes in Fair Value of Level 3 Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Purchase price contingent liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of period	$ 9,547	$ 10,278
Change in value of contingent liability due to estimated future revenue milestones	(712)	3,249
Change in value of contingent liability due to assignment of rights to Soleno		(3,980)
Balance at end of period	8,835	9,547
2018 PIPE Warrant Liability [Member] | Common stock warrant liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of period	$ 31	$ 539
Balance at the beginning of period, in shares	34,241	34,241
Change in value of liabilities	$ (30)	$ (508)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Fair Value Adjustment of Warrants	Fair Value Adjustment of Warrants
Balance at end of period	$ 1	$ 31
Balance at the end of period, in shares	34,241	34,241